EX
- SERIES -
10 years
Ex-relays
warranty
for hazardous locations
Interface Relays Introduction Delcon was founded in 1975 as a specialist manufacturer of solid state interface relays. Our relay design utilizes pulse transformer technology which gives unique advantages over traditional opto coupler based solid state relays and electro mechanical relays. This helps ensure a long lifetime and trouble free performance in harsh industrial applications where difficult loads, noise and interference can cause big problems. Delcon has distributors in more than 20 countries. The largest customer segments are the energy industry, cargo handling at ports, as well as the pulp and paper industry. Delcon’s customers include a number of companies that are the market leaders in their own fields.
Explanations for EX-relay classifications are on page 7.
Problems with interference
Problems with signaling
• Power cables installed adjacent to signal cables, especially over long cable runs, create a capacitive effect that can cause opto coupler/electro mechanical relays to switch on or remain on after the control signal switches off
• Electrical disturbances can cause the LED indicator of the opto coupler / electromechanical relays to glow when the relay is switched off and no input signal present. This makes it difficult to quickly diagnose faults and rectify problems
• Transients in the power supply causes damage to relay coils/ opto coupler relays • Interference from frequency inverters can provide false on/off switching Solution Delcon relays have built in capacitive suppression to allow safe, reliable operation even with very long cable runs. An RC circuit protects the relays from transients and high frequency interference.
Hysteresis
Puls transformer
Output Protection circuitSwitch on Switch off
I
U
y
Current mA
Interference Suppression
Solution The Delcon LED is synchronized with the output so it is impossible for it to glow without being on. The relays have good hysteresis with clearly defined on / off points for reliable operation in high noise environments.
ela lr
a nic
ha
ec
M
n
o elc
y
la re
D
Opto
r relay
couple
Voltage V
Interface Relays
Problems with inductive loads
Problems with high dc voltage
• Contactors and solenoid valves are commonly used throughout the industry, they are also problematic inductive loads for electromechanical relays to handle
• Reduced switching capacity
• Contacts weld
• Electromechanical relays are significantly derated at higher DC voltages • Usually require special version electromechanical relays that are physically bigger and take up more space
• Short lifetime
Solution Delcon AC output relays are rated at 3A and can switch inductive loads without any derating. Delcon DC output relays have no derating up to 24Vdc and thereafter still offer significantly less derating compared to electromechanical relays.
Solution Delcon DC output relay types CHA & CHA4 can switch up to 300Vdc with no derating compared to electromechanical relay and in a smaller package. Example EXO 24CHA4 switching 40ms inductive load at 3A / 110Vdc will give service life of 15 years or more.
10 E-mech relay resistive loads, DC1 E-mech relay inductive loads, L/R 40 ms Delcon relayy inductive loads, L/R 50 ms
Amps.
1
0,1
Volts
0
25
75
125
175
225
275
325
sales@delcon.fi • Tel. +358 9 777 1180
375
Interface Relays Changing relays is a costly business Compared to the total system cost, a relay is a relatively inexpensive component. However, a relay that fails in a system runs the risk of becoming the most expensive component. Choosing a relay with a shorter life span than the entire system will probably result in costly unwanted system downtime! The life span of an industrial system is typically considered to be 15 years. If your application has any of the following requirements then select Delcon relays for a hassle free and safe operation that spans the entire system life.
• Frequent switching - relays operate at least once per minute • Inductive loads – fitting clamp diodes can help but increases switch off time • Inductive loads combined with high switching frequency • High dc voltages
Cost of Delcon
Cost of third replacement
Cost of E-Mech relay
Cost of first replacement
Cost of second replacement
Cost
Cost of downtime
ce Cost pri n o Delc
ce Cost pri lay re h c e E-M 9 year
Lifetime
6 year 3 year Choosing Delcon relays for your system will improve your long term profitability. The cost of system downtime differs depending on the type of industry but is usually very expensive. If we consider only the cost of trouble shooting and replacing a faulty relay for the first time then the initial cost of choosing Delcon is already exceeded.
Delcon is the default choice in many Scandinavian paper mills which is a well known, tough industrial environment. These customers choose Delcon for reliable, safe operation and long term cost savings through minimal maintenance and avoiding costly downtime.
Interface Relays Quick guide CH
AC input relays
DC input relays
• • • •
CHP
Long signal cables (> 100 m) Parallel signal & load cables Radio frequency noise Transient noise
• 2 wire sensor version for leakage current immunity up to 3.5mA
CH
CHF
• Parallel signal & load cables • Radio frequency noise • Transient noise
• High switching frequency
TR
AC output relays
• high switching frequency • resistive loads • inductive loads
CH
DC output relays
CHA & CHA4
• high switching frequency • resistive loads
• inductive loads • high DC-loads
IHA
DC output relay for AC/DC loads
• all AC- and DC-loads • high switching • 0,5 ms off-delay
Mounting bases for EXI-relays: • MIS 1GNEX (screw connectors) • MIS 1CCNEX (spring connectors) • MIS 1TNEX (screw connectors with test contacts) Accessories
Mounting bases for EXO-relays: • MOS 1GNEX (screw connectors) • MOS 1CCNEX (spring connectors) • MOS 1TNEX (screw connectors with test contacts)
For more information please call or visit our website www.delcon.fi
sales@delcon.fi • Tel. +358 9 777 1180
Interface Relays Delcon’s unique interface relays
Field of application Delcon’s interface relays are designed to withstand tough industrial environments. Reliable activation and drop out, very high interference immunity, 4 kV isolation and high load currents provide a maintenance-free process with low service costs and reliable operation. Lifetime is estimated at up to 20 years, depending on the type.
Interference Suppression
Interference Suppression
Puls transformer
Hysteresis
I Hysteresis
Puls transformer
nce sion
Interference Suppression
Output Interference circuit
Protection Hysteresis
Output circuit
Protection
Transient & High Frequency Suppression The relays have integrated protection against transients and EMI can occur on the primary side. I that U
Hysteresis
I
Puls transformer
Hysteresis
InterferenceOutput Suppressioncircuit
Puls transformer
Hysteresis Protection
Puls transformer
Switching Points & Hysteresis The relays have defined activation and drop-out points. I Uvoltage and drop Puls at 2/3 of the U Output Activation occurs nominal Hysteresis Protection transformer circuit out occurs at 1/2 of the nominal voltage. Current hysteresis entails that the relay’s impedance is changed at the activation point; less current is required to hold the relay I U in the activated position. The two functions above ensure a hysteresis between the activation and drop-out point. Activation and drop out are always reliably conducted, even in environments with high interference.
The diagram shows the change-over levels/hysteresis for Delcon’s interface relays compared with mechanical relays and optocouplers. C u r re n t mA
On Of f
De
Re
Protection
Puls transformer
Output circuit
Protection
Pulse transformer Delcon uses a pulse transformer for transmission of the signal from the primary to secondary side, resulting in high energy transfer. This permits the use of heavy duty output components of high quality. In comparison with an optocoupler, which utilises the load side for supply to the internal electronics, the pulse transformer and Delcon’s circuit solution offer many benefits: • Creep distance of 8 mm • 4 kV isolation • Very low leakage current • No demand for min. load • High immunity to load transients • High load currents • High dV/dt values Output circuit
Protection
Solid State Switch & Protection Components AC output TRIAC output semi-conductor. Thanks to the pulse transformer’s strong signal transmission, TRIACs can be used that are less sensitive to rapid load voltage (dV/dt) rise/fall times. Sensitive TRIACs can be activated by rapid voltage changes. This problem is eliminated with Delcon’s interface relays. The SLO24TR standard relay has very low leakage current (0.05 mA) and has varistor protection against load transients. Other AC relays have varistors and RC protection on the secondary side. No minimum load is required and all modules have a wide voltage range. The relays can handle resistive and inductive loads without load currents needing to be reduced. DC output Power MOSFET output semi-conductor. Available for load currents up to 10A in the same compact casing. Transient protection is provided by a zener diode or varistor, which entails that there is no leakage current. Low reduction of load current for inductive loads compared with mechanical relays.
Voltage /current - signal diagram
n lco
Output circuit
U
Suppression Capacitive Suppression When power cables with AC voltage are installed alongside I a signal cable, aUcapacitance occurs between the cables. I U This capacitance creates an undesired current in the signal cable that can affect optocouplers/mechanical relays so that they are activated or do not disconnect when the control signal ceases. Delcon’s relays have integrated protection that prevents capacitive cross-talk from incorrectly activating relays. Installation of power cables beside unshielded signal cables for long distances (>1.5 km) is therefore feasible. Interference Suppression
Interference protection Delcon’s interface relays have interference protection in several layers that effectively prevent false signals from affecting the relays. Only actual control signals pass through the filter.
lay elay cal R ha ni c e er t ro m coupl El e c Opto
Voltage DC
Interface Relays Quick guide HazLoc: • • •
Class I, Division 2, Groups A, B, C, D Class I, Zone 2, IIC T4 (Ta ≤ 70 °C)
Where... Class I = Gases and Vapors Division 2 = Not normally present in an explosive concentration (but may accidentally exist) Groups = A: Acetylene B: Hydrogen, etc. C: Ether, etc. D: Hydrocarbons, fuels, solvents, etc. Zone 2 = Place in which an explosive atmosphere consisting of a mixture with air of flammable substances in the form of gas, vapor or mists is not likely to occur in normal operation but, if it does occur, will persist for a short period only. T4 (Ta ≤ 70 °C) = Maximum surface temperature ATEX: II 3 G Ex nA IIC Gc Where... II = Device group II; There are 2 groups of devices. Devices of Group I, Category M are for use in underground mines and their above ground equipment, which are at risk from firedamp and/ or inflammable dusts. All other areas at risk of explosion are combined in Device Group II. 3G = Category 3; equipment ensuring a normal level of protection. Explosive atmospheres are unlikely to occur. Ex = explosion protection identifier. nA = Protection principle non sparking device. IIC = Explosion group; IIC can be used for all explosion groups (IIA, IIB and IIC). Gc = Protection level; Assured level of protection against becoming an ignition source in normal operation.
IECEx: Ex nA IIC Gc Where... Ex = explosion protection identifier. nA = Protection principle non sparking device. IIC = Explosion group; IIC can be used for all explosion groups. Gc = Protection level; Assured level of protection against becoming an ignition source in normal operation
sales@delcon.fi • Tel. +358 9 777 1180
Interface Relays Ex-input relays: DC-control, AC-load Relay type EXI 12CH EXI 24CH EXI 24CHF EXI 24CHL EXI 48CH EXI 125CH EXI 250CH
Application Limit switches Limit switches Fast connection Increased input current Limit switches Limit switches Limit switches
Control voltage 12 VDC 24 VDC 24 VDC 24 VDC 48 VDC 120 VDC 250 VDC
Load voltage 0...28 VDC 0...28 VDC 0...28 VDC 0...28 VDC 0...28 VDC 0...28 VDC 0...28 VDC
Max. current 50 mA 50 mA 50 mA 50 mA 50 mA 50 mA 50 mA
Load voltage 0...28 VDC 0...28 VDC 0...28 VDC 0...28 VDC 0...28 VDC 0...28 VDC 0...28 VDC 0...28 VDC 0...28 VDC
Max. current 50 mA 50 mA 50 mA 100 mA 50 mA 50 mA 100 mA 50 mA 50 mA
Load voltage 0...60 VDC 0...250 VDC 0...28 VDC 0...28 VDC 0...60 VDC 0...250 VDC 0...28 VDC 0...28 VDC 0...60 VDC 0...250 VDC 0...250 VDC 0...28 VDC 0...28 VDC 0...250 VDC 0...250 VDC 0...28 VDC 0...28 VDC 0...250 VDC 0...250 VDC 0...250 VDC 0...250 VDC
Max. current 3A 1,8 A 10 A* 10 A 3A 1,8 A 10 A* 10 A 3A 1,8 A 4A 10 A* 10 A 1,8 A 4A 10 A* 10 A 1,8 A 4A 1,8 A 4A
Load voltage 0...240 VAC/250 VDC 0...240 VAC 0...240 VAC 0...240 VAC/250 VDC 0...240 VAC 0...240 VAC
Max. current 1,2 A 3A 3A 1,2 A 3A 3A
Load voltage 0...240 VAC 0...240 VAC
Max. current 3A 1,5 A
Ex-input relays: AC-control, DC-load Relay type EXI 25CH EXI 49CH EXI 120CH EXI 120CHI EXI 120CHP EXI 230CH EXI 230CHI EXI 230CHP EXI 230CHR
Application Limit switches Limit switches Limit switches Normally closed operation 2-wire proximity switches Limit switches Normally closed operation 2-wire proximity switches Output current limited
Control voltage 24 VAC 48 VAC 120 VAC 120 VAC 120 VAC 230 VAC 230 VAC 230 VAC 230 VAC
Ex-output relays: DC-control, DC-load Relay type Application EXO 5CH Resistive loads EXO 5CHA Inductive loads EXO 5CHX Resistive loads EXO 5CHXSN Resistive loads EXO 12CH Resistive loads EXO 12CHA Inductive loads EXO 12CHX Resistive loads EXO 12CHXSN Resistive loads, DIN-rail EXO 24CH Resistive loads EXO 24CHA Inductive loads EXO 24CHA4 Inductive loads EXO 24CHX Resistive loads EXO 24CHXSN Resistive loads, DIN-rail EXO 48CHA Inductive loads EXO 48CHA4 Inductive loads EXO 48CHX Resistive loads EXO 48CHXSN Resistive loads, DIN-rail EXO 120CHA Inductive loads EXO 120CHA4 Inductive loads EXO 220CHA Inductive loads EXO 220CHA4 Inductive loads * 6,3 A when used with a mounting base
Control voltage 5 VDC 5 VDC 5 VDC 5 VDC 12 VDC 12 VDC 12 VDC 12 VDC 24 VDC 24 VDC 24 VDC 24 VDC 24 VDC 48 VDC 48 VDC 48 VDC 48 VDC 120 VDC 120 VDC 220 VDC 220 VDC
Ex-output relays: DC-control, AC-load Relay type EXO 5IHA EXO 5TH EXO 12TH EXO 24IHA EXO 24TH EXO 24TR
Application Fast switch-off AC loads AC loads Fast switch-off Wider operation temperature range AC loads
Control voltage 5 VDC 5 VDC 12 VDC 24 VDC 24 VDC 24 VDC
Ex-output relays: AC-control, AC-load Relay type EXO P120TH EXO P230TH
Application AC loads AC loads
Mounting bases for EXI-relays: • MIS 1GNEX (screw connectors) • MIS 1CCNEX (spring connectors) • MIS 1TNEX (screw connectors with test contacts)
Control voltage 120 VAC 230 VAC
Mounting bases for EXO-relays: • MOS 1GNEX (screw connectors) • MOS 1CCNEX (spring connectors) • MOS 1TNEX (screw connectors with test contacts)
Delcon Ltd. Veikkointie 4 FI-03100 Nummela Finland Tel. +358 9 777 1180 e-mail: sales@delcon.fi
Sales sales@delcon.fi